郑州市暴雨的气候特征

统计分析了郑州市7站自建站始至2005年的全部暴雨天气过程,结果显示:暴雨天气发生在夏半年(4~10月);单站暴雨年平均1.3~2.8次,区域性暴雨年平均1.5次;郑州地区暴雨出现次数南部多于北部,东部多于西部,其中登封是郑州市出现暴雨次数最多的测站;暴雨次数的年际变化呈明显波动形势;造成郑州市夏季暴雨的主要天气系统有低槽型、切变线型、副高西伸型、台风或台风倒槽型等。

Synoptic and Climatic Analysis of Torrential Rain in Zhengzhou

The paper analyzes the rainstorm process from 1951 to 2005 in Zhengzhou meteorological stations.The results indicate that rainstorm often occurs during April to October.The rainstorm annual mean is 1.3~2.8 in single station, but annual mean is 1.5 in the region.The number of rainstorm occurrence in the southern areas is larger than that in the northern areas,eastern is larger than western.Dengfeng has the most frequent rainstorm,and what's more its interannual change shows an obviously fluctuate trend.The mean weather systems of causing summer rainstorm are the following types: low trough,shear line,westward extension of the subtropical high,typhoon and typhoon inverted.